1315251646 has 4 divisors (see below), whose sum is σ = 1972877472. Its totient is φ = 657625822.

The previous prime is 1315251629. The next prime is 1315251647. The reversal of 1315251646 is 6461525131.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315251647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328812910 + ... + 328812913.

It is an arithmetic number, because the mean of its divisors is an integer number (493219368).

Almost surely, 2^1315251646 is an apocalyptic number.

1315251646 is a deficient number, since it is larger than the sum of its proper divisors (657625826).

1315251646 is an equidigital number, since it uses as much as digits as its factorization.

1315251646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657625825.

The product of its digits is 21600, while the sum is 34.

The square root of 1315251646 is about 36266.3983047669. The cubic root of 1315251646 is about 1095.6443865331.

Adding to 1315251646 its reverse (6461525131), we get a palindrome (7776776777).

The spelling of 1315251646 in words is "one billion, three hundred fifteen million, two hundred fifty-one thousand, six hundred forty-six".